Zynga CFO leaves amid major executive shakeup

It's been a rough few weeks for Zynga, which was forced to slash both its workforce and its 2012 outlook last month. Now CFO Dave Wehner is jumping ship for, of all companies, Facebook.

Zynga, whose main business is making Facebook games like FarmVille, announced Wehner's exit late Tuesday. After two years in his role at Zynga, Wehner is leaving for a "senior finance position" at Facebook(FB).

Wehner helped "guide the company's transition from startup through IPO," CEO Mark Pincus said in a blog post . Zynga made its public debut in December 2011. Its shares have lost 78% of their value since then, currently languishing near just $2.

The new CFO will be Mark Vranesh, who will also retain his current title of chief accounting officer. Vranesh had served as Zynga CFO from 2008 to 2010.

But the CFO role isn't the only one Zynga(ZNGA) is switching up. David Ko, former head of mobile operations, has been promoted to chief operations officer. That position had been vacant since John Schappert stepped down in August.

Business development head Barry Cottle will move up to the chief revenue officer position, and Steven Chiang will become president of games.

"These changes come at an important time," Pincus wrote in his blog post. "We are positioning ourselves for long-term growth and I'm confident that we have the breadth and depth of management talent to deliver on our mission of connecting the world through games."

Pincus did acknowledge, however, that "we still have a lot of work to do."

Those concerns were in sharp focus on October 5, when Zynga "pre-announced" its third-quarter earnings -- rarely a sign of anything good. The company scaled back its outlook for 2012, and also said it would take a write-down on half of its purchase of "Draw Something" maker OMGPOP. Perhaps more concerning, Zynga warned of weakness in its flagship -Ville games line and it cited delays in launching new games.

Just three weeks later, Zynga laid off 5% of its employees. The company shuttered its Boston studio, laid off staff at its Austin office, and proposed closures of its Japan and UK outposts.

But once Zynga did officially announce its third-quarter earnings, on October 25, it ended up surprising Wall Street. Sales topped analysts' expectations, and investors cheered a new partnership with bwin.party, an international gaming operator that will enable real money casino games like poker, slots, and roulette in the U.K.